feat: WF always reads from DB + vol bypass threshold

- buy() now always loads WF history from trade_results DB directly
  (not lazy-cached in memory) → restart-safe, no stale-history issue
- Added WF_VOL_BYPASS_THRESH (default 10.0x): if vol_ratio at entry
  exceeds this threshold, WF filter is skipped regardless of win rate
- buy() now accepts vol_ratio param; runner.py passes it from
  get_active_signals() for both fast-poll and main scan loops

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

daemon/runner.py

@@ -35,8 +35,9 @@ def _fast_poll_loop() -> None:
                         break
                     try:
                         if should_buy(ticker):
-                            logger.info(f"[빠른감시] 매수 신호: {ticker}")
-                            trader.buy(ticker)
+                            vol_r = signals.get(ticker, {}).get("vol_ratio", 0.0)
+                            logger.info(f"[빠른감시] 매수 신호: {ticker} (vol={vol_r:.1f}x)")
+                            trader.buy(ticker, vol_ratio=vol_r)
                         time.sleep(0.1)
                     except Exception as e:
                         logger.error(f"[빠른감시] 오류 {ticker}: {e}")
@@ -85,8 +86,9 @@ def run_scanner() -> None:
 
                 try:
                     if should_buy(ticker):
-                        logger.info(f"매수 신호: {ticker}")
-                        trader.buy(ticker)
+                        vol_r = get_active_signals().get(ticker, {}).get("vol_ratio", 0.0)
+                        logger.info(f"매수 신호: {ticker} (vol={vol_r:.1f}x)")
+                        trader.buy(ticker, vol_ratio=vol_r)
                     time.sleep(0.15)  # API rate limit 방지
                 except Exception as e:
                     logger.error(f"스캔 오류 {ticker}: {e}")